Journal
MATERIALS SCIENCE AND TECHNOLOGY
Volume 36, Issue 13, Pages 1407-1418Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02670836.2020.1784543
Keywords
P91-steel; P91B-steel; effect of boron; Gleeble simulation; intercritical heat-affected zone; electron back-scattered diffraction; recrystallisation; impression creep
Funding
- Board of Research in Nuclear Sciences (BRNS) [GAP-0260]
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Conventional P91 and boron modified P91-steels were considered in the present investigation. Using Gleeble, weld intercritical heat-affected zone (ICHAZ) was processed. Conventional microscopy was done along with electron back-scattered diffraction for both specimens. Lath boundary of martensite was more, and preferably oriented for P91B-ICHAZ than P91-ICHAZ. Lattice strain was high and lath mobility was low for P91B-ICHAZ in comparison to P91-ICHAZ. Large fraction of ferritic grain structure (39.1%) and small fraction of fresh martensitic grain structure (9.5%) in P91-ICHAZ, whereas small fraction of ferritic grain structure (10.7%) and large fraction of fresh martensitic grain structure (32.7%) in P91B-ICHAZ was observed. However, tempered martensite exhibited meager variation. These differences between ICHAZ simulations were attributed to the presence of 100ppm-boron in P91B-steel.
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